Table 13.

Confusion matrix results of occlusal plane classification diagnosis for MAD.

		Prediction
		−k	k = 0	+k
Actual	−k	5	0	0
	k = 0	0	2	0
	+k	0	0	3

Evaluation criteria: In the plane rectangular coordinate system, when the value of k is positive, the occlusal plane is oblique upwards. When the k value is negative, the occlusal plane is oblique downwards. At k = 0, the occlusal plane is parallel to the horizontal plane.